Fluvial Flood Depth Climate Change Difference Grid (2004)

Modelled fluvial flood depth and climate change depth difference data is a 5x5 meter resolution raster grid showing the difference in flood depth between baseline conditions and a climate change scenario with a 20% increase in peak flows. The dataset was produced in 2004 using the JFlow two-dimensional hydrodynamic model as part of a generalised modelling project to define Flood Zones for spatial planning in England. It covers specific 100x100km Ordnance Survey grid tiles (e.g., NY, NX, NT) and is provided for both the 1% and 0.1% annual chance flood events.

Use Cases

• Assessing potential changes in flood inundation extent for spatial planning based on a 2004 climate change scenario.
• Comparing baseline and climate-adjusted flood depths at a 5-meter grid resolution for regional studies.
• Informing preliminary strategic flood risk assessments where detailed local models are absent.

Strengths

• Provides a consistent, England-wide modelled baseline for climate change impact on fluvial flooding from 2004.
• Offers high spatial detail with data on a standardized 5x5 meter grid.
• Generated using a specific, named hydrodynamic model (JFlow).

Limitations

• The dataset has not been updated since its creation in 2004, and climate change allowances have since changed.
• Sources conflict on the annual chance of flooding covered, with some specifying 1% and others 0.1%.
• Metadata for size, row count, license, and author is consistently missing across all platform entries.

Provenance

Source

Environment Agency (UK)

Collection Method

Produced as a by-product of the 2004 generalised modelling project using the JFlow two-dimensional hydrodynamic model.

Time Range

2004

Freshness

Last metadata update recorded as 2026-07-06, but the underlying data is from 2004 and is explicitly stated as not updated.

Geography

England, specifically for 100x100km Ordnance Survey National Grid tiles (e.g., NY, NX, NT).